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• alternatives for google adwords? [on hold]

  - by cauchy

  I'm making tests on my landing page, and trying to get some traffic using google adwords. Everytime I make a change or add a new keyword, I have to wait for two or three days for google to aprove the keywords. I'm in Italy, don't know if this happens anywhere else. But is really upsetting. Note: they keywords are things like fortran, SaaS, python... So, I'm looking for an adwords alternative that is fast. That is, if I change the keywords, I can start getting traffic as soon as possible without the long approval time. PD: I've found many alternatives to adwords, but they don't say anything about how fast your adds and keywords are approved which is my major problem right now. That, and price.

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• Unity, Unrealistic Sphere On Inclined Plane

  - by user1086516

  So I am trying to model a ball rolling down an inclined surface in Unity based on what I am observing in real life but it is still quite off. In Unity it takes the ball about 3 seconds to travel from a place to another specified place where in real life it only takes 1 second. The ball isn't as fast to react to the incline as in real life (even though I have tried giving the ball and surface low or zero friction values) The ball does not accelerate as nearly as fast as it does in real life What do I do to give the ball more realistic behavior ? I have tried messing around with mass, physics materials, drag, and angular drag on the ball and surface but it doesn't seem to be helping.

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• Code for Controlling the Bike in a bike game

  - by user1489257

  I'm new(ish) to Actionscript 3 and I was wondering what the code what would be like for controlling the bike in a game. I have a two main questions: Is Box2D the best physics engine to go with for this type of game? How would the animation of the bike work. Would I have to create a bike animation of the wheels moving and make it start and stop when the key to go forward is pressed. How would I go about it slowly stopping when the key to go forward is released? Thanks.

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• Does low latency code sometimes have to be "ugly"?

  - by user997112

  (This is mainly aimed at those who have specific knowledge of low latency systems, to avoid people just answering with unsubstantiated opinions). Do you feel there is a trade-off between writing "nice" object orientated code and writing very fast low latency code? For instance, avoiding virtual functions in C++/the overhead of polymorphism etc- re-writing code which looks nasty, but is very fast etc? It stands to reason- who cares if it looks ugly (so long as its maintainable)- if you need speed, you need speed? I would be interested to hear from people who have worked in such areas.

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• Multiple authoritative DNS server on same IPv4 address

  - by Adrien Clerc

  I'd like to maintain a DNS tunnel on my self-hosted server at example.com. I also have a DNS server on it, which serves everything for example.com. I'm currently using dns2tcp for DNS tunneling, on the domain tunnel.example.com. NSD3 is used for serving authoritative zones, because it is both simple and secure. However, I have only one public IPv4 address, which means that NSD and dns2tcp can't listen on the same IP/port. So I'm currently using PowerDNS Recursor using the forward-zones parameter like this: forward-zones-recurse=tunnel.example.com=1.2.3.4:5354 forward-zones=example.com=1.2.3.4:5353 This enables request for authoritative zone to be asked to the correct server, as well as for tunnel requests. NSD is listening on port 5353 and dns2tcp on port 5354. However, this is bad, because the recursor needs to be open. And it actually answers to any recursive query. Do you have any solution for that? I really prefer a solution that doesn't involve setting up BIND, but if you are in the mood to convince me, don't hesitate to do so ;) EDIT: I change the title to be clearer.

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• HAProxy + NodeJS gets stuck on TCP Retransmission

  - by sled

  I have a HAProxy + NodeJS + Rails Setup, I use the NodeJS Server for file upload purposes. The problem I'm facing is that if I'm uploading through haproxy to nodejs and a "TCP (Fast) Retransmission" occurs because of a lost packet the TX rate on the client drops to zero for about 5-10 secs and gets flooded with TCP Retransmissions. This does not occur if I upload to NodeJS directly (TCP Retransmission happens too but it doesn't get stuck with dozens of retransmission attempts). My test setup is a simple HTML4 FORM (method POST) with a single file input field. The NodeJS Server only reads the incoming data and does nothing else. I've tested this on multiple machines, networks, browsers, always the same issue. Here's a TCP Traffic Dump from the client while uploading a file: ..... TCP 1506 [TCP segment of a reassembled PDU] >> everything is uploading fine until: TCP 1506 [TCP Fast Retransmission] [TCP segment of a reassembled PDU] TCP 66 [TCP Dup ACK 7392#1] 63265 > http [ACK] Seq=4844161 Ack=1 Win=524280 Len=0 TSval=657047088 TSecr=79373730 TCP 1506 [TCP Retransmission] [TCP segment of a reassembled PDU] >> the last message is repeated about 50 times for >>5-10 secs<< (TX drops to 0 on client, RX drops to 0 on server) TCP 1506 [TCP segment of a reassembled PDU] >> upload continues until the next TCP Fast Retransmission and the same thing happens again The haproxy.conf (haproxy v1.4.18 stable) is the following: global log 127.0.0.1 local1 debug maxconn 4096 # Total Max Connections. This is dependent on ulimit nbproc 2 defaults log global mode http option httplog option tcplog frontend http-in bind *:80 timeout client 6000 acl is_websocket path_beg /node/ use_backend node_backend if is_websocket default_backend app_backend # Rails Server (via nginx+passenger) backend app_backend option httpclose option forwardfor timeout server 30000 timeout connect 4000 server app1 127.0.0.1:3000 # node.js backend node_backend reqrep ^([^\ ]*)\ /node/(.*) \1\ /\2 option httpclose option forwardfor timeout queue 5000 timeout server 6000 timeout connect 5000 server node1 127.0.0.1:3200 weight 1 maxconn 4096 Thanks for reading! :) Simon

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• SMB access from XP to Windows 2008 R2

  - by Pablo

  Here's the thing... I have a very slow file copy performance from Windows XP clients to Windows 2008R2 servers. Here are the facts: Windows XP to Windows 2K3: Fast Windows XP to Windows 2K8: Very Slow Windows 7 to Windows (any): Fast Despite the fact that the obvious solution would be to upgrade to Windows 7, well, we have 900 desktops so it's not an option in the short time. I have tried everything: Disabling SMB2.0, disabling security signatures, changing the TCP Window size, disabling the W2K8 auto tuning, upgraded the drivers, etc. We eliminated the network; both the server and the client are connected to the same core switch (no hops, no routers, same VLAN). Upon monitoring the network with a packet capture utility, we see that the SMB packets being exchanged between the W2K8 and the XP machines are very small packets (256 bytes); despite the fact that the MTUs are properly set (1500) and there is no fragmentation whatsoever. In fact, those SMB packets show, on the IP datagram, that the window is 65535 or close. The same trace, made using the same application but instead of using a W2K8 share uses a Windows XP share (and that goes FAST) shows SMB packets of 4096 bytes. I can post the traces if necessary. So, why does XP-W2K8 negotiation arrange for 24-bytes SMB payload, whereas the XP-XP negotiation arranges for 4096 SMB packets? Any ideas? I am running short of those...

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• Network connection to Firebird 2.1 became slow after upgrading to Ubuntu 10.04

  - by lyle

  We've got a setup that we're using for different clients : a program connecting to a Firebird server on a local network. So far we mostly used 32bit processors running Ubuntu LTS (recently upgraded to 10.04). Now we introduced servers running on 64bit processors, running Ubuntu 10.04 64bit. Suddenly some queries run slower than they used to. In short: running the query locally works fine on both 64bit and 32bit servers, but when running the same queries over the network the 64bit server is suddenly much slower. We did a few checks with both local and remote connections to both 64bit and 32bit servers, using identical databases and identical queries, running in Flamerobin. Running the query locally takes a negligible amount of time: 0.008s on the 64bit server, 0.014s on the 32bit servers. So the servers themselves are running fine. Running the queries over the network, the 64bit server suddenly needs up to 0.160s to respond, while the 32bit server responds in 0.055s. So the older servers are twice as fast over the network, in spite of the newer servers being twice as fast if run locally. Apart from that the setup is identical. All servers are running the same installation of Ubuntu 10.04, same version of Firebird and so on, the only difference is that some are 64 and some 32bit. Any idea?? I tried to google it, but I couldn't find any complains that Firebird 64bit is slower than Firebird 32bit, except that the Firebird 2.1 change log mentions that there's a new network API which is twice as fast, as soon as the drivers are updated to use it. So I could imagine that the 64bit driver is still using the old API, but that's a bit of a stretch, I guess. Thanx in advance for any replies! :)

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• Outlook slow to open attachments

  - by Alistair McMillan

  When a colleague tries to open attachments in her email (Outlook 2003 talking to an Exchange 2007 server) they talk ages to open. The files are relatively small, all less than 1MB. We've tried creating a new Windows profile for the user and tried creating new Outlook profiles, however that hasn't made any difference. And we've tried accessing her account from someone else's PC, and the attachments open immediately there. The only thing that might provide a clue is that Process Monitor shows Outlook on her PC trying to write the file to a folder within the user's "Temporary Internet Files" folder with FAST I/O DISALLOWED errors. Can't find a lot of useful information on that message online though. What causes the FAST I/O DISALLOWED errors? And would that make opening attachments so incredibly slow that opening a < 1MB file can take a matter of minutes? UPDATE: Discovered that this isn't just an issue with Outlook. Other files being accessed over the network show the same FAST I/O DISALLOWED errors in Process Monitor. The problem is just more noticeable with Outlook, because although other applications take a while to open files it isn't a matter of minutes.

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• How to setup equivalent USVIDEO.ORG DNS-Proxy on Linux

  - by Gary

  I have a VPS in the USA running Ubuntu. I want to setup something similar to http://www.usvideo.org Basically, USVIDEO is a DNS service that allows Canadians to access American content like Hulu, Netflix, NBC, and etc (restricted by geographical IP). Here is how I think USVideo does it: Clients (PS3, XBOX, PC) specifies the DNS server(s) as specified on USVIDEO.org's website. If the DNS request is a video/audio site such as Netflix or Pandora, forward the request to a proxy. Otherwise, for all other requests, forward it to a different DNS server. If the specific video/audio URL is requested, return the address of the proxy server, which in turn relays traffic to the destination video/audio domain via the U.S. gateway so that it appears that the access is coming from a U.S. IP address. Once the DNS request has passed the U.S. IP address check, their proxy server steps out of the loop and lets the video streaming site contact you directly to start the video stream. This trick relies on the way that the video streaming sites check the country of your IP address once up front, but don't actually check the country of the destination IP address while the video is streaming. What is elegant about this solution is that a VPN Tunnel is not required to bypass geographical IP checks from certain websites. All that is required on the client side is to specify the DNS server (the VPS). If a certain site is geographically locked, just forward the traffic to a proxy, and that's it. These sites can be specified in the DNS entries, or perhaps in the proxy service to redirect the DNS request to its own proxy. I believe what I need to setup something similar is Squid Proxy, IPTables, and DNS. What I need help is how to exactly approach this? Would Squid Proxy be setup as a transparent proxy?

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• Opening port 80 in router has no results

  - by Ricardo Pieper

  A friend of mine has a ADSL modem and I need to forward some ports. I have already forwarded the 1521 port (Oracle) and it's working fine. Now I need to forward the port 80. I already set up his IIS bindings to this port, and also forwarded the port like this video shows: https://www.youtube.com/watch?v=DLKD-fyexoo So I think I did everything correctly. The local IP address is also the same as the machine where the IIS server is running. I'm sorry, but I can't post images since i don't have 10 points :( Somehow I can't forward this port, yougetsignal.com keeps saying that the door is closed. When I try to open the port, the Control Panel says me that I have to access the control panel in the 8080 port, because the 80 port will be open. Ok, that's fine. But I'm still able to access it in the 80 port, and when I try to access it in the 8080 port, it doesn't work. I'm trying it with the TPLINK 8816, but I also tried to open it in the Opticom DsLink 279, and it didn't worked (using another machine), I got the exact same results. He has a dynamic IP address, but he is also using No-ip, so I can always access his Oracle database in a certain static address. The 1521 port is open. I also tried to disable the firewall in Windows, but that makes no sense to me, since the router doesn't really open the port 80. Clearly I'm missing something. I have never done it in my life, so I dont know how to proceed. Restarting the router was the first I did, no results. I'm accessing his laptop through TeamViewer, so I'm testing the port outside his local network. Edit: My ISP says that they allow to open ports, and the 1521 port is opened. What could I do to open the 80 port?

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• Simple options for port forwarding to a different port?

  - by Nick

  I have three network printers at our local office, all of which listen on port 9100. Non of them offer the option of changing the listening port. We have a single public static IP address, and access to our main network is through a Linksys WRT-54G. We need to be able to print to these printers from outside the office. The problem is, with the 54G, I can only forward a port to the SAME port on a particular IP address. What I really need though is a way to forward to an ip address and a DIFFERENT port. I need to do this: In port Destination 9100 192.168.1.1 : 9100 9101 192.168.1.2 : 9100 9102 192.168.1.3 : 9100 So I'm looking for options. I could setup an old computer with two network cards and IPtables I suppose, but that seems like a lot of overhead for something relatively simple. Is there a way a virtual machine (read: one network card) could do the advanced port forwarding? Where I forward all traffic to it, and it forwards it on to the right printer? Or what about those mini Linux distros that replace the WRT-54G's firmware? Do any of those support what I need "out of the box"? I have a spare WRT- could I make it an IP tables router? Recommendations for mini distros? Or is there an off-the-shelf product that does this (cheap/local preferred)? Any advice / options appreciated. Thanks!

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• How to route to a secondary interface on the same physical ethernet?

  - by sjose3612611

  INTERNET<->(wan)BRIDGED_DEVICE(lan)<->ETH_ROUTER<->LAN Problem: Need to access web server on BRIDGED_DEVICE's LAN from INTERNET via ROUTER (BRIDGED_DEVICE's web server cannot be accessed form INTERNET since it has no Public management IP). Cannot configure bridged device. It has a static IP on its LAN to which its web server binds. Attempt: Create a secondary/alias WAN Interface on ETH_ROUTER (e.g Primary: eth0.1 (for internet access) and Secondary: eth0.2 (for accessing web server on BRIDGED_DEVICE), (No VLANs). eth0.1 has a public IP; eth0.2 has a static private IP in the BRIDGED_DEVICE's subnet (e.g 10.0.X.Y). Iptables on ETH_ROUTER: Added a port forward (DNAT) from eth0.1 to eth0.2: iptables -t nat -I PREROUTING -i eth0.1 -p tcp --dport 80 -j DNAT --to-destination 10.0.X.Y iptables -t nat -I POSTROUTING -o eth0.2 -s 10.0.X.0/24 -j MASQUERADE Stateful firewall w/ overall drop policy on FORWARD chain, hence: iptables -I FORWARD -i eth0.1 -d 10.0.X.Y -p tcp --dport 80 -j ACCEPT Can ping from ETH_ROUTER to BRIDGED_DEVICE but unable to reach the web server from Internet. I see packet cont increasing for the DNAT rule but not sure where it disappears in the ETH_ROUTER after that. ETH_ROUTER is the only device that can be configured to achieve this. If familiar with this scenario, please suggest what I may be missing or doing wrong here or suggest techniques to debug?

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• Postfix unable to find local server

  - by Andrew

  I'm working with postfix on fedora 9 and I'm attempting to make some changes to a system setup by my predecessor. Currently the postfix server on [mail.ourdomain.com] is setup to forward mail sent to two addresses to another server for processing. The other server [www01.ourdomain.com] receives the email and sends it to a PHP script to be processed. Then that PHP script generates and sends a response to the user who sent the original email. We're adding more web servers to the system and as a result we've decided to move these processing scripts to our admin [admin.ourdomain.com] server to make them easier to keep track of. I've already setup and tested the processing scripts on [admin.ourdomain.com], and on the mail server doing the forwarding [mail.ourdomain.com] I added [admin.ourdomain.com] to /etc/hosts and also added another, aside from the one for [www01.ourdomain.com], entry to /etc/postfix/transport for [admin.ourdomain.com]. I also restarted postfix as well. I've tested the communication from [mail.ourdomain.com] to [admin.ourdomain.com] using telnet and the [admin.ourdomain.com] domain and everything runs correctly. But as soon as I change the forward address and attempt to send an email to the mail server I get a bounce message stating "Host or domain name not found. Name service error for name=admin.ourdomain.com type=A: Host not found". If I change the forward settings back to [www01.ourdomain.com] then everything works fine. Is there some setting I'm missing in Postfix? The server itself and telnet work fine it just seems to be postfix that's not able to discover the location of [admin.ourdomain.com].

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• Can anyone explain these differences between two similar i7 processors? [closed]

  - by Brian Frost

  I have two systems I've just built. They both have i7 processors and Asus P8Z77 motherboards. When I run a simple processor loop benchmark that I wrote in Delphi some time back I get one machine showing nealry twice as fast as the other. I then used CPU-Z to dump me the details of the hardware and I see that the fast machine shows: Processor 1 ID = 0 Number of cores 4 (max 8) Number of threads 8 (max 16) Name Intel Core i7 2700K Codename Sandy Bridge Specification Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz Package (platform ID) Socket 1155 LGA (0x1) CPUID 6.A.7 Extended CPUID 6.2A Core Stepping D2 Technology 32 nm TDP Limit 95 Watts Core Speed 3610.7 MHz Multiplier x FSB 36.0 x 100.3 MHz Stock frequency 3500 MHz the slow machine shows: Processor 1 ID = 0 Number of cores 4 (max 8) Number of threads 8 (max 16) Name Intel Core i7 2600K Codename Sandy Bridge Specification Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz Package (platform ID) Socket 1155 LGA (0x1) CPUID 6.A.7 Extended CPUID 6.2A Core Stepping D2 Technology 32 nm TDP Limit 95 Watts Core Speed 1648.2 MHz Multiplier x FSB 16.0 x 103.0 MHz Stock frequency 3400 MHz i.e the slow machine has a 2600k to the fast machine 2700k. The very different "Multiplier x FSB" must be significant but I dont understand how two processors with a very 'similar' number can be so different. To get the machines the same must I copy the processors or is there some clever setting that I can change? Thanks for any help. Brian.

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• IP-dependent local port-forwarding on Linux

  - by chronos

  I have configured my server's sshd to listen on a non-standard port 42. However, at work I am behind a firewall/proxy, which only allow outgoing connections to ports 21, 22, 80 and 443. Consequently, I cannot ssh to my server from work, which is bad. I do not want to return sshd to port 22. The idea is this: on my server, locally forward port 22 to port 42 if source IP is matching the external IP of my work's network. For clarity, let us assume that my server's IP is 169.1.1.1 (on eth1), and my work external IP is 169.250.250.250. For all IPs different from 169.250.250.250, my server should respond with an expected 'connection refused', as it does for a non-listening port. I'm very new to iptables. I have briefly looked through the long iptables manual and these related / relevant questions: http://serverfault.com/questions/57872/iptables-question-forwarding-port-x-to-an-ssh-port-of-different-machine-on-the-n http://serverfault.com/questions/140622/how-can-i-port-forward-with-iptables However, those questions deal with more complicated several-host scenarios, and it is not clear to me which tables and chains I should use for local port-forwarding, and if I should have 2 rules (for "question" and "answer" packets), or only 1 rule for "question" packets. So far I have only enabled forwarding via sysctl. I will start testing solutions tomorrow, and will appreciate pointers or maybe case-specific examples for implementing my simple scenario. Is the draft solution below correct? iptables -A INPUT [-m state] [-i eth1] --source 169.250.250.250 -p tcp --destination 169.1.1.1:42 --dport 22 --state NEW,ESTABLISHED,RELATED -j ACCEPT Should I use the mangle table instead of filter? And/or FORWARD chain instead of INPUT?

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• fail2ban block ports rules iptable

  - by J Spen

  I just installed Ubuntu Server 14.04 and don't have much experience with IPtables. I am trying to get a basic setup going where I only accept SSH connections on port 22 and 2222. I actually have that working with no problem using fail2ban ssh. Then I wanted to block all other ports except 423 and 4242 but either method of DROPing all connections that are not listed seems not to work and it blocks me out of everything. Below is the setup that works: -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -N fail2ban-ssh -A INPUT -p tcp -m multiport --dports 22,2222 -j fail2ban-ssh -A fail2ban-ssh -j RETURN I tried to change it either to: -P INPUT DROP -P FORWARD ACCEPT -P OUTPUT ACCEPT -N fail2ban-ssh -A INPUT -p tcp -m multiport --dports 22,2222 -j fail2ban-ssh -A fail2ban-ssh -j RETURN or: -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -N fail2ban-ssh -A INPUT -p tcp -m multiport --dports 22,2222 -j fail2ban-ssh -A INPUT -j DROP -A fail2ban-ssh -j RETURN I have noticed that the rules for fail2ban-ssh are automatically added to my iptables on boot because if I save them with iptables-persistant they are entered twice. How do I go about blocking everything accept those 2 ports using fail2ban? Is it a bad fail2ban configuration or do I need to add the fail2ban-ssh -j Return somewhere else in my code.

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• Routing table on Linux not respected

  - by MRHaarmann

  I have a very specific problem, building a Linux VPN endpoint (with external VPN Gateway), which should route certain networks over the tunnel, others via default gateway. The Linux VPN should do a NAT on the outgoing connections for the VPN peers. Setup is as following: Internet gateway LAN 192.168.25.1/24 VPN Gateway LAN 10.45.99.2/24 (VPN tunnel 10.45.99.1 to net 87.115.17.40/29, separate connection to Internet) Linux VPN Router eth0 192.168.25.71/24 eth0:503 10.45.99.1/24 Default 192.168.25.1 route to 87.115.17.40/29 via 10.45.99.2 (send_redirects disabled, ip_forward enabled) Linux clients (multiple): eth0 192.168.25.x/24 Default 192.168.25.1 route to 87.115.17.40/29 via 192.168.25.71 Ping to the machines via tunnel from the VPN Router is working. Now I want to establish a routing from my clients over the VPN gateway and the client packet gets routed to 192.168.25.1 ! traceroute output shows the packets get routed to 192.168.25.71, but then to 192.168.25.1. So the route is not respected in forward ! IPTables and Routing: ip route show 87.115.17.40/29 via 10.45.99.2 dev eth0 10.45.99.0/24 dev eth0 proto kernel scope link src 10.45.99.1 192.168.25.0/24 dev eth0 proto kernel scope link src 192.168.25.71 default via 192.168.25.1 dev eth0 iptables -A INPUT -i eth0:503 -j REJECT iptables -t nat -A POSTROUTING -o eth0:503 -j MASQUERADE iptables -A FORWARD -i eth0:503 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 192.168.25.0/24 -o eth0:503 -j ACCEPT So what is wrong with my setup ? The route is chosen correctly from localhost, but all the clients get forwarded to the Internet GW. thanks for helping, Marcus

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• GIT : I keep having to merge my new branch

  - by mnml

  Hi, I have created a new branch and I'm working on it with others dev but for reasons when I want to push my new commits I always have to git merge origin/mynewbranch Otherwise I'm getting some errors: ! [rejected] mynewbranch -> mynewbranch (non-fast-forward) error: failed to push some refs to '[email protected]/repo.git' To prevent you from losing history, non-fast-forward updates were rejected Merge the remote changes before pushing again. See the 'Note about fast-forwards' section of 'git push --help' for details. You asked me to pull without telling me which branch you want to merge with, and 'branch.mynewbranch.merge' in your configuration file does not tell me, either. Please specify which branch you want to use on the command line and try again (e.g. 'git pull <repository> <refspec>'). See git-pull(1) for details. If you often merge with the same branch, you may want to use something like the following in your configuration file: [branch "mynewbranch"] remote = <nickname> merge = <remote-ref> [remote "<nickname>"] url = <url> fetch = <refspec> See git-config(1) for details. Why is it not automatic? Thanks

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• iptables -- OK, **now** am I doing it right?

  - by Agvorth

  This is a follow up to a previous question where I asked whether my iptables config is correct. CentOS 5.3 system. Intended result: block everything except ping, ssh, Apache, and SSL. Based on xenoterracide's advice and the other responses to the question (thanks guys), I created this script: # Establish a clean slate iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -F # Flush all rules iptables -X # Delete all chains # Disable routing. Drop packets if they reach the end of the chain. iptables -P FORWARD DROP # Drop all packets with a bad state iptables -A INPUT -m state --state INVALID -j DROP # Accept any packets that have something to do with ones we've sent on outbound iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT # Accept any packets coming or going on localhost (this can be very important) iptables -A INPUT -i lo -j ACCEPT # Accept ICMP iptables -A INPUT -p icmp -j ACCEPT # Allow ssh iptables -A INPUT -p tcp --dport 22 -j ACCEPT # Allow httpd iptables -A INPUT -p tcp --dport 80 -j ACCEPT # Allow SSL iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Block all other traffic iptables -A INPUT -j DROP Now when I list the rules I get... # iptables -L -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 DROP all -- any any anywhere anywhere state INVALID 9 612 ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT all -- lo any anywhere anywhere 0 0 ACCEPT icmp -- any any anywhere anywhere 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:ssh 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:https 0 0 DROP all -- any any anywhere anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 5 packets, 644 bytes) pkts bytes target prot opt in out source destination I ran it and I can still log in, so that's good. Anyone notice anything major out of wack?

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• Trobleshooting extremely slow opening times in Win7 for documents on Win2k8 server

  - by Mazupan

  Hello. It's hard even to describe my problem. It seems there's only problem with extreme slow openings (up to 10 minutes) on Windows 7 (on XP things works fine) for files that are stored on Windows Server 2008. And now what I discovered up till now. If I open (some files, not all, not allways) .doc and .xls files with doubleclicking it takes up to 10 minutes to finaly open the file. In that time, file seems to be locked for all other users. If I cancel opening, file remains locked for some time. Owner on that files is the one who last wrote changes in them. If I change the owner to larger group, which I am member of file gets opened super fast. When opened file can be saved normaly and fast. That file reopens fast. One other user reports that there is only problem when opening the files for the first time in a day. When he openes first file he has no problems with other files at all (or so he says). He also states that when accessing files from home via VPN he has no such problems with files. And now: anybody has a clue where to start looking? I suppose that is misconfiguration problem. But where? File system? Permissions? DFS? VMWare network config? My setup is as follows: Physical server: HP Prolian ML350 G6 Virtual host: VMWare ESXi 4 Guest: Windows Server 2008 Standard Files are accessed via DFS shares. Please help me. Thanks. Mazupan

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• Network structure --> Server 2k8r2 <--> Livebox <--> Router <--> Other PCs

  - by Yusuf

  I have a Livebox connection to the Internet and I have set up my network as follows: - Livebox <--> Win2k8R2 Server - Livebox <--> Netgear N150 Router - Router <--> Other PCs Therefore, in my LAN, - the Livebox has IP address 192.168.1.1, - the Router 192.168.1.12 (when accessed from the Livebox or the server), - the Router 10.0.0.1 (when accessed from the PCs connected to the Router), - the server 192.168.1.2, - the PCs 10.0.0.x I was using a previous configuration, which was as follows: - Livebox <--> Netgear N150 Router - Router <--> Win2k8R2 Server - Router <--> Other PCs Everything was simple, and I just had to forward all ports for incoming connection on the Livebox to the Router, and then forward the specific ports to the Server as needed (it must be however noted that any server I use is found on the Win2k8R2 server itself). In this previous configuration, the IP addresses were as follows: - Livebox 192.168.1.1 - Router 192.168.1.12 (when seen from Livebox) - Router 10.0.0.1 (when seen from server & PCs connected to it) - Server 10.0.0.2 - PCs 10.0.0.x So now of course, my port-forwarding does not work anymore since the server is not connected (directly) to the Router. What I would like to know is how do I configure the Livebox and Router to still have the features like before? From what I understand of networks (which is very limited, btw), I see these options: Make the router assign IPs like 192.168.1.x (but then I want the forwarding to be done from the router itself, is it possible?) The forwarding on the router to the server uses IP address 10.0.0.2. I could change it to 192.168.1.2 (Is that even possible, does it work?) Forward all ports from the Livebox itself to the server, and then manage them there (Is software-based port-forwarding as secure as hardware-based?)

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• Problems forwarding port 3306 on iptables with CentOS

  - by BoDiE2003

  Im trying to add a forward to the mysql server at 200.58.126.52 to allow the access from 200.58.125.39, and Im using the following rules (its my whole iptables of the VPS of my hosting). I can connect locally at the server that holds the mysql service as localhost, but not from outside. Can someone check if the following rules are fine? Thank you # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp -s 200.58.125.39 --dport 3306 -j ACCEPT -A INPUT -p tcp -s 200.58.125.39 --sport 1024:65535 -d localhost --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT -A OUTPUT -p tcp -s localhost --sport 3306 -d 200.58.125.39 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT COMMIT And this is the output of the connection trial. [root@qwhosti /home/qwhosti/public_html/admin/config] # mysql -u user_db -p -h 200.58.126.52 Enter password: ERROR 2003 (HY000): Can't connect to MySQL server on '200.58.126.52' (113)

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• Windows 7 boot animation slows down startup by default?

  - by kngofwrld

  I just upgraded my HDD to an SSD drive. I am running a completely fresh install and enjoy the short boot time. I tweaked the startup to be as fast as I could by removing unneeded apps and such. Nor am I running a solid desktop background (which causes a 30-sec startup delay). I have a 2.1ghz 64 bit laptop with 4 gigs of ram, so it's not a liquid-cooled speed monster, but I checked some super high end PC boot vids on YouTube and noticed that they startup in almost the same time as my machine. I also noticed that the glowing Windows 7 animation plays all the way no matter how fast the PC is. I turned off the animation, and the startup time is unchanged. I turned on verbose startup info and noticed that it runs until the very end, where it looks like it just sits there for no reason waiting for something to happen for a few seconds. So now I think that the Windows 7 startup animation has a timer built into it that forces the computer to wait for no other reason than to play the full animation. Super-fast XP boot vids on YouTube seem to start much faster (and not just because they "have less to load"). Am I imagining things? My question is: How can I turn off not just the animation, but the timer for the animation. Here is a vid that tipped me off, I have no relation to the poster. (warning: soundtrack might be loud) http://www.youtube.com/watch?v=T5LkX3xejJ4

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• Duplicate forwarded messages in Blackberry when using BIS

  - by Avery Payne

  Our Setup External email arrives at a Postfix server, is scanned, and then forwarded via settings in transport (using the RELAY:[{ip-address}] for a given address) to an Exchange 2007 server. Some users are on Exchange, but a few are still on the Postfix server (they will be moved in the near future). IMAPS is provided for external connections via Dovecot; in-house, IMAP is provided for the Gateway and native MAPI is used for Exchange/Outlook. Blackberries are connected via BIS, which uses Dovecot as a reverse-proxy IMAPS service to connect to Exchange (when the mailbox exists on Exchange, otherwise it connects to the mailbox on the gateway). The Issue We have a user that, when they forward an email on their Outlook client, they get a duplicate of the original message on their Blackberry. When I say duplicate, I mean that they have a copy of the forwarded version of the message (i.e. their version of the message that they obtained hitting the forward button), and a copy of the original message that shows up at the same time. The expected behavior is to just see the forwarded message, not the forwarded message and a 2nd copy of the original message. We've only seen this with Outlook users that also have a Blackberry. Other IMAP clients, such as OS X Mail or Thunderbird, do not exhibit this behavior when connecting to the Exchange server; forwarded messages work as expected. The Questions what is causing this to happen? why does it only affect Outlook/Blackberry setups, and not TBird/Blackberry or OSX-Mail/Blackberry? how do we get it to stop, before people go insane and never forward messages again?

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